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Area of Science:

  • Physics
  • Materials Science
  • Metamaterials

Background:

  • Particle diffusion is fundamental across many systems, necessitating effective control mechanisms.
  • Existing methods for manipulating diffusion often involve complex structures or parameters.

Purpose of the Study:

  • To design a versatile structure for controlling particle diffusion.
  • To explore the emergence of geometric phase in dynamic systems.
  • To develop a tunable particle-diffusion cloak with simplified requirements.

Main Methods:

  • Designing a basic structure with two counter-rotating rings and a stationary intermediate layer.
  • Analyzing particle exchange dynamics and velocity exceptional points.
  • Investigating the enhancement of effective diffusivity for cloak fabrication.

Main Results:

  • The proposed structure facilitates particle exchange, leading to an exceptional point of velocity.
  • A geometric phase is observed during velocity loop evolution around the exceptional point.
  • The structure enhances effective diffusivity, enabling a bilayer particle-diffusion cloak.
  • The cloak utilizes homogeneous parameters, simple structures, and velocity-controlled on/off functionality.

Conclusions:

  • The study introduces a novel method for particle diffusion control via dynamic structures.
  • The findings expand the understanding of geometric phases in velocity-driven systems.
  • The research provides a blueprint for designing advanced particle-diffusion metamaterials.